Improvement in fire-boxes



M t' a %vw w. ENNIS;

Fire-Box.

Patented June 8,1875.

THE GRAPHIC CKLPNOTO -LITNJQSLM PARK PLACEJLY UNITED STATES PATENTOFFICE! WILLIAM ENNIS, OF *NEW YORK, N. Y.

- W IMPROVEMENT IN FlRE-BOXES.

Specification forming part of Letters Patcnt No. l64,280, dated June 8,1875; application filed October 22, 1874.

To all whom it may conccm:

Be it known that I, WILLIAM ENNIS, of the city, county, and State of NewYork, have invented an Improvement in Fire-Boxes, of which the followingis a specification:

The object of my invention is to introduce into furnaces or fire-places,for the combustion of fue1,jets of air, by the aid of appliances, whichwill effectually resst the destructive action of the fire, which I willnow proceed to explain, reference being had to the accompanying drawing,in which- Figure 1 is a longitudinal section of my improved fire-placefor furnaces; Fig. 2, a transverse vertical section; and Fig. 3, asectional plan.

A and A' are the opposite side walls of the furnace; D, the rear wall,and G the front wall, in which is the usual feed-opening a provided withsuitable doors, and the opening b communicating with the ash-pit. Fromthe front to the back of the furnace extend fire-clay pipes M, two beingshown in the present instance, and each pipe is supported by an internalbar, N, of iron, which I prefer to make of the semi-tubular form shownin Fig. 2.

In order to afi'ord facilities for the removing and replacin g of thepipes M, without disturbing the supporting-bars, I make each pipe in twoparts, which are retained in their proper position by fireclay slabs d,introduced between the pipes and the side walls and between the pipesthemselves, the slabs leaving apertures of sufficient area for the freeupward passage of the products of combustion of the fuel on the grate Hto the point where they are to be utilized. The pipes M communicate withopenings in the front wall of the furnace, and these openings may beexposed to the air, or may communicate with any suitable blowingapparatus, as the use to which the furnace has to be applied, and thecharacter of the fuel, may require. In the lower portion of the pipes Mare a number of openings, through which jets of air can pass downwardand commingle with the gaseous products of combustion, therebyconverting them into flames of intense heat.

The position of the openings m in the pipes M may be varied. When noblower is used, for instance, the openings may so Situated. that airwill pass into the fire-place in the inclined direction pointed out bythe arrows, Fig. 2; but when blasts of air are introduced the openingsmay be such as to direct the air vertically onto the fuel.

In some cases the spaces between the pipes M may be entirely closed, andthe products of combustion directed through an opening or openings inthe rear wall of the furnace, as shown by dotted lines, in which case Iprefcr to make the air-openings w in the tubes inclined in the directionof the arrows, Fig. 1, so that jets of air will meet the products ofcombustion as they pass to the outlet.

It will be observed that the internal supporting-bars are protected fromthe direct and destructive action of the fire by the pipes, and thatthey are further protected by being exposed to the air passing throughthe said pipes; and hence, that this protection ot' the bars insures thepermanency of the applianccs, by which the air is introduced into thefurnace from above.

I claim as my inventionl. The combination, with a furnace of fireclaypipes M, supported by internal bars of iron, and having openings,through which air admitted to the said pipes can pass downward therefrominto the fire-place, all substantially as set forth.

2. The combination of the pipes M, each made in two parts, the internalsupportingbars, and the retaining-slabs d, all as speci fied.

In testimony whereof I have signed my name to this specificaton in thepresence of two subscribing witnesses.

WILLIAM EN NIS. Witnesses:

WILLIAM HENRY WILLIs, DAVID SEAMAN, Jr.

